ERECTING CATENARY AND CONTACT WIRES - THE SRS WAY
THE BASE VEHICLE
SRS wiring ‘trains’ are based on a single 26 tonne SRS road rail wiring unit. It carries two hydraulically operated cable drum carriers and is fi tted with wire manipulating rollers both fore and aft. The drum carriers are designed to dispense wire at up to 75% full tension. They can push wire out and reel it in. The manipulating rollers move both laterally and vertically, and horizontal rollers within the roller assembly allow two wires to be dispensed simultaneously, one above the other.
This versatile vehicle may be used for many different wiring tasks. Typical is its incorporation in an SRS ‘train’ for putting up catenary and contact wires together.
Using four vehicles, the SRS wiring train eliminates the need for temporary rollers and slings. The vehicles are:
One 26 tonne SRS wiring unit Two 17 ton SRS mobile elevated platforms (MEWPs) One 17 ton SRS scissors platform They proceed, at half span intervals, as follows:
1. The base vehicle carrying two cable drums, one with catenary and one with contact wire. This moves along the track dispensing both catenary and contact wires simultaneously, the catenary above the contact wire.
2. The fi rst MEWP with the catenary wire running in a purpose made grooved roller which is fi xed to the MEWP basket. It can be positioned precisely by moving the basket so that the linesman can clip it directly into the catenary clamp on the contact registration arm.
3. The second MEWP follows. This time the contact wire is running through a purpose made grooved pulley fi xed to the MEWP basket. Again it is positioned by moving the basket and, if the span is long, fi xed to the catenary by a temporary wire.
4. Finally, the scissors platform follows closely, carrying droppers to be clipped to both catenary and contact wires
Using this SRS procedure:
Kinks and wire deformation are virtually eliminated because wires are run at 75% full tension. Also wire run at 75% full tension is unlikely to roll over. Thus the task of chasing and fl ushing out twists is removed. A single run through to check the groove is usually suffi cient.
Sag between rollers and temporary tie wires is minimised by running near to full tension reducing the risk of kinks and protecting the wire from the damage or contamination which may occur if it touches the ground.
Flaking is made easy by the variable resistance of the hydraulic drum, particularly at the start of a new run.
Correct positioning is ensured by hydraulically controlled guide rollers which may be manipulated both vertically and horizontally so that wire may be run out as close to the required route as possible
Pulling or towing wire out is eliminated because the drum can ‘pump’ wire out.
Safety is ensured by guide rollers which completely encompass the wire so that it cannot jump free, important for the safety of following linesmen.
It is possible to dispense wire at 5 kph. Speed is usually limited by the rate at which linesmen can work.
This is just one of many wiring tasks which SRS vehicles can perform with their highly trained and motivated operators.
Tell us the task. We will provide the tools and the people. INTERNATIONAL
HIRE & SALES
To hire or buy road rail at its best call: +44 (0) 870 050 9242, email
info@srsrailuk.co.uk, or visit our website
www.srsrailuk.com
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